Venus offers its Venus Women's Goddess Low Rise Bikini Bottoms in 16 colors (Bright White pictured) for $29. With $4.95 for shipping via coupon code "XWEBWEL1530", that's $15 off and the lowest total price we could find. It comes in sizes 2 to 12.
Also available is the Venus Women's Goddess Enhancer Top in 15 colors for $29 with the above shipping. That's $17 off and another price low. It comes in sizes A to DD.